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Trivial change to support GCC's configuration procedure.

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This commit is contained in:
Paul Eggert 2003-09-23 23:05:08 +00:00
parent b0236a9bc3
commit f207e9bdb5
4 changed files with 39 additions and 4 deletions
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15
ChangeLog
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@ -1,3 +1,18 @@
2003-09-23 Paul Eggert <eggert@twinsun.com>
* doc/autoconf.texi (Limitations of Builtins): Document test -h
versus test -L issues.
2003-09-23 Daniel Jacobowitz <drow@mvista.com> and
Paul Eggert <eggert@twinsun.com>
Trivial change to support GCC's configuration procedure.
* lib/autoconf/c.m4 (AC_PROG_CPP_WERROR): New macro.
* lib/autoconf/headers.m4 (_AC_CHECK_HEADER_MONGREL): Don't warn
about inconsistency if the preprocessor is set to give errors for
any warning.
* doc/autoconf.texi (C Compiler Characteristics): Document this.
2003-09-13 Alexandre Duret-Lutz <adl@gnu.org>
* Makefile.am (autom4te-update, autom4te_files): Fetch Struct.pm

16
doc/autoconf.texi
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@ -5302,6 +5302,17 @@ Some preprocessors don't indicate missing include files by the error
status. For such preprocessors an internal variable is set that causes
other macros to check the standard error from the preprocessor and
consider the test failed if any warnings have been reported.
For most preprocessors, though, warnings do not cause include-file
tests to fail unless @code{AC_PROG_CPP_WERROR} is also specified.
@end defmac
@defmac AC_PROG_CPP_WERROR
@acindex{PROG_CPP_WERROR}
@ovindex CPP
This acts like @code{AC_PROG_CPP}, except it treats warnings from the
preprocessor as errors even if the preprocessor exit status indicates
success. This is useful for avoiding headers that generate mandatory
warnings, such as deprecation notices.
@end defmac
@ -10209,7 +10220,10 @@ the host system. But occasionally you may find it necessary to check
whether some arbitrary file exists. To do so, use @samp{test -f} or
@samp{test -r}. Do not use @samp{test -x}, because 4.3@acronym{BSD} does not
have it. Do not use @samp{test -e} either, because Solaris 2.5 does not
have it.
have it. To test for symbolic links on systems that have them, use
@samp{test -h} rather than @samp{test -L}; either form conforms to
@acronym{POSIX} 1003.1-2001, but older shells like Solaris 8
@code{/bin/sh} support only @option{-h}.
@item @command{test} (strings)
@c ---------------------------

6
lib/autoconf/c.m4
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@ -419,6 +419,12 @@ AC_SUBST(CPP)dnl
AC_LANG_POP(C)dnl
])# AC_PROG_CPP
# AC_PROG_CPP_WERROR
# ------------------
# Treat warnings from the preprocessor as errors.
AC_DEFUN([AC_PROG_CPP_WERROR],
[AC_REQUIRE([AC_PROG_CPP])dnl
ac_c_preproc_warn_flag=yes])# AC_PROG_CPP_WERROR
# AC_LANG_COMPILER(C)
# -------------------

6
lib/autoconf/headers.m4
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@ -121,13 +121,13 @@ AC_PREPROC_IFELSE([AC_LANG_SOURCE([@%:@include <$1>])],
AC_MSG_RESULT([$ac_header_preproc])
# So? What about this header?
case $ac_header_compiler:$ac_header_preproc in
yes:no )
case $ac_header_compiler:$ac_header_preproc:$ac_[]_AC_LANG_ABBREV[]_preproc_warn_flag in
yes:no: )
AC_MSG_WARN([$1: accepted by the compiler, rejected by the preprocessor!])
AC_MSG_WARN([$1: proceeding with the compiler's result])
ac_header_preproc=yes
;;
no:yes )
no:yes:* )
AC_MSG_WARN([$1: present but cannot be compiled])
AC_MSG_WARN([$1: check for missing prerequisite headers?])
AC_MSG_WARN([$1: see the Autoconf documentation])